Time-Dependent Cryospheric Longwave Surface Emissivity Feedback in the Community Earth System Model
Frozen and unfrozen surfaces exhibit different longwave surface emissivities with different spectral characteristics, and outgoing longwave radiation and cooling rates are reduced for unfrozen scenes relative to frozen ones. In this paper physically realistic modeling of spectrally resolved surface...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | http://www.osti.gov/servlets/purl/1464160 https://www.osti.gov/biblio/1464160 https://doi.org/10.1002/2017JD027595 |
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ftosti:oai:osti.gov:1464160 2023-07-30T03:55:44+02:00 Time-Dependent Cryospheric Longwave Surface Emissivity Feedback in the Community Earth System Model Kuo, Chaincy Feldman, Daniel R. Huang, Xianglei Flanner, Mark Yang, Ping Chen, Xiuhong 2023-02-23 application/pdf http://www.osti.gov/servlets/purl/1464160 https://www.osti.gov/biblio/1464160 https://doi.org/10.1002/2017JD027595 unknown http://www.osti.gov/servlets/purl/1464160 https://www.osti.gov/biblio/1464160 https://doi.org/10.1002/2017JD027595 doi:10.1002/2017JD027595 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1002/2017JD027595 2023-07-11T09:28:09Z Frozen and unfrozen surfaces exhibit different longwave surface emissivities with different spectral characteristics, and outgoing longwave radiation and cooling rates are reduced for unfrozen scenes relative to frozen ones. In this paper physically realistic modeling of spectrally resolved surface emissivity throughout the coupled model components of the Community Earth System Model (CESM) is advanced, and implications for model high-latitude biases and feedbacks are evaluated. It is shown that despite a surface emissivity feedback amplitude that is, at most, a few percent of the surface albedo feedback amplitude, the inclusion of realistic, harmonized longwave, spectrally resolved emissivity information in CESM1.2.2 reduces wintertime Arctic surface temperature biases from -7.2 ± 0.9 K to -1.1 ± 1.2 K, relative to observations. The bias reduction is most pronounced in the Arctic Ocean, a region for which Coupled Model Intercomparison Project version 5 (CMIP5) models exhibit the largest mean wintertime cold bias, suggesting that persistent polar temperature biases can be lessened by including this physically based process across model components. The ice emissivity feedback of CESM1.2.2 is evaluated under a warming scenario with a kernel-based approach, and it is found that emissivity radiative kernels exhibit water vapor and cloud cover dependence, thereby varying spatially and decreasing in magnitude over the course of the scenario from secular changes in atmospheric thermodynamics and cloud patterns. Finally, accounting for the temporally varying radiative responses can yield diagnosed feedbacks that differ in sign from those obtained from conventional climatological feedback analysis methods. Other/Unknown Material albedo Arctic Arctic Ocean SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Arctic Ocean Journal of Geophysical Research: Atmospheres 123 2 789 813 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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language |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Kuo, Chaincy Feldman, Daniel R. Huang, Xianglei Flanner, Mark Yang, Ping Chen, Xiuhong Time-Dependent Cryospheric Longwave Surface Emissivity Feedback in the Community Earth System Model |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Frozen and unfrozen surfaces exhibit different longwave surface emissivities with different spectral characteristics, and outgoing longwave radiation and cooling rates are reduced for unfrozen scenes relative to frozen ones. In this paper physically realistic modeling of spectrally resolved surface emissivity throughout the coupled model components of the Community Earth System Model (CESM) is advanced, and implications for model high-latitude biases and feedbacks are evaluated. It is shown that despite a surface emissivity feedback amplitude that is, at most, a few percent of the surface albedo feedback amplitude, the inclusion of realistic, harmonized longwave, spectrally resolved emissivity information in CESM1.2.2 reduces wintertime Arctic surface temperature biases from -7.2 ± 0.9 K to -1.1 ± 1.2 K, relative to observations. The bias reduction is most pronounced in the Arctic Ocean, a region for which Coupled Model Intercomparison Project version 5 (CMIP5) models exhibit the largest mean wintertime cold bias, suggesting that persistent polar temperature biases can be lessened by including this physically based process across model components. The ice emissivity feedback of CESM1.2.2 is evaluated under a warming scenario with a kernel-based approach, and it is found that emissivity radiative kernels exhibit water vapor and cloud cover dependence, thereby varying spatially and decreasing in magnitude over the course of the scenario from secular changes in atmospheric thermodynamics and cloud patterns. Finally, accounting for the temporally varying radiative responses can yield diagnosed feedbacks that differ in sign from those obtained from conventional climatological feedback analysis methods. |
author |
Kuo, Chaincy Feldman, Daniel R. Huang, Xianglei Flanner, Mark Yang, Ping Chen, Xiuhong |
author_facet |
Kuo, Chaincy Feldman, Daniel R. Huang, Xianglei Flanner, Mark Yang, Ping Chen, Xiuhong |
author_sort |
Kuo, Chaincy |
title |
Time-Dependent Cryospheric Longwave Surface Emissivity Feedback in the Community Earth System Model |
title_short |
Time-Dependent Cryospheric Longwave Surface Emissivity Feedback in the Community Earth System Model |
title_full |
Time-Dependent Cryospheric Longwave Surface Emissivity Feedback in the Community Earth System Model |
title_fullStr |
Time-Dependent Cryospheric Longwave Surface Emissivity Feedback in the Community Earth System Model |
title_full_unstemmed |
Time-Dependent Cryospheric Longwave Surface Emissivity Feedback in the Community Earth System Model |
title_sort |
time-dependent cryospheric longwave surface emissivity feedback in the community earth system model |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1464160 https://www.osti.gov/biblio/1464160 https://doi.org/10.1002/2017JD027595 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
albedo Arctic Arctic Ocean |
genre_facet |
albedo Arctic Arctic Ocean |
op_relation |
http://www.osti.gov/servlets/purl/1464160 https://www.osti.gov/biblio/1464160 https://doi.org/10.1002/2017JD027595 doi:10.1002/2017JD027595 |
op_doi |
https://doi.org/10.1002/2017JD027595 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
123 |
container_issue |
2 |
container_start_page |
789 |
op_container_end_page |
813 |
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1772821349382750208 |